diff --git a/Tools/ardupilotwaf/boards.py b/Tools/ardupilotwaf/boards.py
index d7e0e803c4..e0fe4937a9 100644
--- a/Tools/ardupilotwaf/boards.py
+++ b/Tools/ardupilotwaf/boards.py
@@ -317,8 +317,8 @@ class Board:
             if self.cc_version_gte(cfg, 7, 4):
                 env.CXXFLAGS += [
                     '-Werror=implicit-fallthrough',
-                    '-Wmaybe-uninitialized',
-                    '-Wduplicated-cond',
+                    '-Werror=maybe-uninitialized',
+                    '-Werror=duplicated-cond',
                     '-Werror=sizeof-pointer-div',
                 ]